SCADA system for islanded DC microgrids

This paper develops a supervisory control and data acquisition (SCADA) system to monitor an islanded DC microgrid including wind turbine, photovoltaics, and battery units. The SCADA system is based on KingView 6.55, and establishes data communication between the host and the slave computers through intelligent modules and different communication techniques. The developed SCADA system can monitor real-time parameters such as voltages, currents, or powers, and can store the important parameters into the database. Users can get historical data realistically and effectively through SQL access. When some values in the system exceed or fall below the predetermine limits, the SCADA system can pop up the alarm screen, give an alert and send a text message or call an specified person via an SMS module. The host not only can monitor the operation status of the system, but also give orders to control the action of the slaves. This way, it implements the combination of required monitoring and control functions. The SCADA system includes an energy management system (EMS), monitoring of state of charge (SOC) of the battery management system (BMS), and black start operation. The system is in operation in a DC microgrid system in Tianjin, China.